schaeffer



Aug. 25, 1925. 1,551,431

C. SCHAE FER CYLINDER HEAD FOR INTERNAL COMBUSTIObi ENGINES Filed July18. 1922 2 Sheets-Sheet l Biz/672207" Aug. 25, 1925. C. SCHAEFFERCYLINDER HEAD FOR INTERNAL COMBUSTION ENGINES Filed July 18. 1922 2Sheen-Shoot 2 r 70mm 3 na FMS Patented Aug. 25, 1925.

UNITED STATES j PATENT .CHARLES'SCHAEFFER, oFrARrs, FRANCE, ASSIGNOR rosoorn'm i nus Ancinns ETABLISSEMENTS'PANHARD ET :LEVASSQR, OF PARIS,FRANCE.=

CYLINDER HEAD non INTERNAL-GOMBUSTION ENGINES. i

Application fi1'ed J'u1y'18, 1922. [serial No. 575,903.

To all whom it may concern V Be it known that I, CHARLES SGHAEEFER, acitizen of the Republic of France, and 'residing at Paris (SeineDepartment), No. '19 Avenue dIvry, in the Republic of France, haveinvented certain'new and useful Improvements in Cylinder Heads forInternal- Combustion Engines, of which the following is a specification.

This invention relates to the manufacture of cylinder heads for internalcombustion engines of the valveless type. In knowndevices the cylinderheads of said engines, which comprise an external portion of cylindricalshape and an internal portion forming a combustion chamber and seat forthe spark plug, are made in a single cast piece.

This method of manufacture has serious drawbacks. The porous charactergenerally possessed by the cast pieces will cause a considerable wasteinthe manufacture; the walls have an irregular thickness, leading to themoulding of greater thicknesses than are absolutely necessary, whencethe relatively great weight of the material which is prejudicial toeconomy in the manufacture.

In the present invention, the cylinder,

heads are on the contrary made in two or more pieces, and by reason ofthis separation, all parts of the cylinder head can be treated bymachine in a ready and exact manner, so that they will have the maximumlightness and will be perfectly balanced, besides being capable ofwithstanding all required stresses in the best conditions.

In this event the various pieces can be made of steel or bronze or likealloy having equivalent properties, and can be assembled by screwing,hard soldering or welding or by like means. i

For this purpose, the circular joint be tween the two pieces forming thecylinder head, instead of being made upon a diameter which issubstantially equalto the periphery of said cylinder head, is made upona reduced diameter around the socket of the spark plug, and in thismanner the connection between the two pieces and the soldering substancewhich consolidates the same will be obliged tosupport a much smallerstress.

Various forms of construction of a cylinder head according to thisinvention are shown in vertical section in Figs. 1, 2 and 3 example."

of the accompanying drawing by figvay "of The cylinder head,Fig. 1, isedmp sea of the outer member 1 and the inner member 2, whereof the firsthaving a cylindricalshape is provided at the top with a flange 3servingto secure it on the cylinder; it has at the exterior a set offlanges 4 adapted to receive packing members and in the interior a'circular shoulder 5. The inner member 2 is provided with a portion whichspreads out at the bottom with an edge 6 co-operating with the shoulder5, as well as a portion which spreads out at the top, the junction ofthese two parts forming a seat 7 intended to receive; a spark plug.These two pieces are connected by a welded joint at 8. By reason of theshoulder 5, the violent shocks due to the combustion of gas are directlytransmitted from member 2 to member 1', so that the joint 8 sufiers noexcessive strain.

' In Figs. 2 and 3, the outer part 1 of the cylinder head is integralwith a conical part 9 serving as a support for the inner member 2; saidconical part is provided with a groove 10 wherein is disposed a collar11 ending the member 2. When mounting the device, said collar iscylindrical as shown in Fig. 8, and it is then changed in shape byhammering or by seating so as to extend into the groove 10, Fig. 2. Allthe cavities are then filled up with solder 12 which comes flush withthe inner walls of the cone 9.

In practice, the collar 11 is preferably overturned by seating, and theniswelled as above stated, but without departing from the invention, thetwo pieces could be secured together by screwing or by like means withor without soldering, provided the proper tightness is secured; asobserved, each of the members may be readily treated by machine in theinterior and at the exterior in an exact and perfect manner.

Claims:

1. Cylinder head for internal combustion engine composed of a peripheralportion and a central portion which are distinct from each other, saidperipheral portion having an external cylinder part and a disk-shapedinternal part whereof the central aperture is relatively small, theinternal edge of said aperture havingv a groove formed therein and thecentral portion of the cylinder head having an annular extension fittinginto said central aperture, the edge of said extension being outwardlyflared and engaging 1n said groove.

2. The structureof claim 3 having the flared. portion of the centralportion secured in the groove of the peripheral portion by solder.

3. A cylinder head for internal combustion engines composed of an outerpart and of a central part which are distinct the one from the other,worked separately and then soldered together, the outer part having aninternal circular groove and the inner part having a flange adapted tobe forced into the said groove.

4. A cylinder head for internal combustion engines composed of an outerperipheral part and a central inner part which are distinct from eachother, said inner part having a cup-shaped portion of much less diameterthan the outer part to provide a wide space between said parts andhaving in the inner end of said cup-shaped portion a threaded openingfor the reception of a spark plug and an interlocking joint connectionbetween said parts whereby when assembled and connected they form aunitary structure.

In testimony that I claim the foregoing as my invention I have signed myname.

CHARLES SCHAEFFER.

